Improvement in stairs



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Letters Patent No. 92,356, (lated July G, 1869.

IMPROVEMENT IN STAIRS.

The Schedule'refen'ed to in these Letters Patent .and making part of the same.

To all whom lt 'may-concerns Be it known that I, NInLs IOULSON, of New York city, county of New York, and State of New York,-

have` inventeda new and iuseful Improvement in Stairs; and I do hereby declare the following to bc a full, clear, and exact description of the same, reference being had to the accompanying drawings, in

whichf Figures l and 3 are side elevations, partly in section. Figures 2 and 4 are plan views, partly in section.

. Figure 5 is a transverse vertical section of a casing for a tread consisting of onc'plate.

Figure 6 is a transverse vertical section of a casing or receptacle for atrfead, the front edge or nosing of which is adjustable.

The'same letters of reference, where employed in the .dilierent figures, denote identical parts.

The nature of my invention consists in constructing stairs in such a manner that ythe treads consist of a hollow casing or receptacle, into which any suitable material ot' 'composition of matter may be placed. When said material or composition of matter is worn out or decayed, it may easily be removed and replaced, without any injury to the staircase. K

To enable others to make and use my improvement, I will proceed/to ldescribe its operation and construction. l

Fig. 5 represents a transverse verticalsection of a tread, and illustrates at oncemy invention.

A is a plate, madeofcast-ron or any other suitable material. At its front edge it is curved upward, as shown iuiig. 5, at- A, and at its rear side and ends it is bent at a right angle, and extends upward until it reaches the upper face of the tread. 'The recess thus lbrmed is iilled with some suitable material or compo- Isit-ion of matter, which is not easily worn or decayed;

Concrete, asphaltuui, terra-cotta, tiles, stone, or marble tiles, cork, wood, or any other suitable material, (lire-proof is recommended,) may be used,'accordiug to the notion of the builder.,

Figs. .l and 4 show different designs of patterns for treads, and my invention enables the builder to choose the material or composition that may harmonize with the walls or iioors ot' the halls in which thestairs are to be placed. v

Fig. l represents a side elevation of exterior stairs, and lig. 3 is a side elevation of interior stairs.

My improvement may be used with advantage as well for exterior as interior stairs, and is not confined to iron, but may be used in any kindy of stairs.

If desired, the panels and risings may be ornamented, in same manner as the treads of the-stairs, with inlaid lillin 'llige casing or receptacle for the tread may either consist offone or more pices, and so constructed that the front edge or nosing A may be made adjustable, so as to be removed and replacedr by another when worn out. (See g. 6.)

In figs. 1 and 5, the casing or receptacle for the A tread A3- is constructed with an uneven inner sniff-ace, so thatV the concrete will more readily Iadhere to it.

In the rsame gures the casing A4 is, at its luner surface, provided with projections, cast to the plate A,

in 0111er to keep the material or composition of matter with which'it is filled in its place. For such projections a a a c, nails, hooks, or bolts may be used. If desired, the heads of bolts may rest on or in the material or composition constituting the tread, and passing through the plate A, be fastened to the bot tom or lower surface of plate A.

/ I do not conine myself to any of thc above devices,

which may be varied indenitely.

When the casing for the tread is to contain any materialv which does not necessitate such projections, its

inne-r surface may be made smooth, as vshown in gs.

1 and 5, at A.

Ilhe casings ,or receptacles for the treads may be filled and finished before the stairs are put up.

Having thus described my invention,- VVhat I claim, and desire t'o secure by Letters Patent, is f A hollow casing orreceptacle, into whichA any suitablcmaterial or composition of matter may be placed, serving as treads or pia forms for stairs, constructed and arranged substantia ly as and for the purpose lset forth.

witnesses. NIELS POULSON.

In testimony whereof, I have signed my name to y this specification, in the presence of two subscribing 

